No power at some taillights bulbs?

2007 MERCEDES BENZ R350

58,567 MILES • V6 • 2WD • AUTOMATIC

BLESSING EWOBOR

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Hello, one reverse bulb and three other bulbs were not functioning, I replaced the bulb. The brake light and the reverse bulb came up but the two bulbs on the right and left indicated below did not light up. Testing with test light confirmed that there is no power at both sides for those particular bulbs.
Could I get a wire diagram?
And suggestions could be of help.
Thank you

Image (Click to enlarge)

Oct 12, 2023 at 9:51 AM

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STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS

It sounds like the ground is bad, or the rear SAM module needs to be replaced. Here is the ground location and the rear light wiring diagrams as requested. Also, I have included how to change the rear SAM module out in case you need it. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

Images (Click to enlarge)

Oct 12, 2023 at 11:44 AM